On 2018-12-23 10:44 p.m., Yu Zhao wrote:
On Fri, Dec 21, 2018 at 10:07:26AM +0100, Michel Dänzer wrote:
On 2018-12-21 4:10 a.m., Yu Zhao wrote:
Userspace may request pitch alignment that is not supported by GPU. Some requests 32, but GPU ignores it and uses default 64 when cpp is 4. If GEM object is allocated based on the smaller alignment, GPU DMA will go out of bound.
For GPU that does frame buffer compression, DMA writing out of bound memory will cause memory corruption.
Signed-off-by: Yu Zhao yuzhao@google.com
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c index e309d26170db..755daa332f8a 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c @@ -527,6 +527,15 @@ amdgpu_display_user_framebuffer_create(struct drm_device *dev, struct drm_gem_object *obj; struct amdgpu_framebuffer *amdgpu_fb; int ret;
- struct amdgpu_device *adev = dev->dev_private;
- int cpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0);
- int pitch = amdgpu_align_pitch(adev, mode_cmd->width, cpp, false);
Also, this needs to use mode_cmd->pitches[0] instead of mode_cmd->width, otherwise it'll spuriously fail for larger but well-aligned pitches.
Actually mode_cmd->pitches[0] is aligned mode_cmd->width multiplied by cpp. So we can't just use mode_cmd->pitches[0].
Use mode_cmd->pitches[0] / cpp then?
And I'm not sure if the hardware works with larger alignment
It does.
(it certainly ignores smaller alignment).
Yeah, pitch must be >= width. Maybe this patch could check that as well.